linux-kernel - Re: [linux-next:master] [x86/module] 6661cae1aa: WARNING:at_arch/x86/mm/pat/set_memory.c:#__cpa_process

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Message-ID: <615e9d81-dac8-41de-9831-5792bdb3f3bf@csgroup.eu>
Date: Mon, 14 Oct 2024 18:35:39 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Mike Rapoport <rppt@...nel.org>, Dave Hansen <dave.hansen@...el.com>
Cc: kernel test robot <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev,
 lkp@...el.com, Linux Memory Management List <linux-mm@...ck.org>,
 Andrew Morton <akpm@...ux-foundation.org>,
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 Ard Biesheuvel <ardb@...nel.org>, Arnd Bergmann <arnd@...db.de>,
 Borislav Petkov <bp@...en8.de>, Brian Cain <bcain@...cinc.com>,
 Catalin Marinas <catalin.marinas@....com>,
 Christoph Hellwig <hch@...radead.org>,
 Dave Hansen <dave.hansen@...ux.intel.com>, Dinh Nguyen
 <dinguyen@...nel.org>, Geert Uytterhoeven <geert@...ux-m68k.org>,
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 linux-kernel@...r.kernel.org
Subject: Re: [linux-next:master] [x86/module] 6661cae1aa:
 WARNING:at_arch/x86/mm/pat/set_memory.c:#__cpa_process_fault

Le 13/10/2024 à 10:17, Mike Rapoport a écrit :
> On Fri, Oct 11, 2024 at 09:30:33AM -0700, Dave Hansen wrote:
>> On 10/11/24 08:40, Mike Rapoport wrote:
>>> On Fri, Oct 11, 2024 at 07:00:01AM -0700, Dave Hansen wrote:
>>>> On 10/11/24 06:08, Mike Rapoport wrote:
>>>>> This patch disables ROX caches on 32-bit, it should fix the issue.
>>>> While I'm not going to shed a tear for 32-bit, what's the actual
>>>> compatibility issue with 32-bit?
>>>  From the stack trace it looks like execmem tries to update the direct map
>>> for highmem memory, and cpa is not happy about it.
>>
>> First of all, if it's a highmem problem, shouldn't the check be for
>> CONFIG_HIGHMEM and not on 32-bit vs. 64-bit?  We do have non-highmem
>> 32-bit configs.
> 
> 32 bit also does not have ARCH_HUGE_VMALLOC and execmem cache will be
> anyway populated with 4k pages, so I don't see why it would be useful on 32
> bit all.
>   

Are you talking about X86 only or any architecture ?

On powerpc we have:

arch/powerpc/Kconfig:   select HAVE_ARCH_HUGE_VMALLOC           if 
HAVE_ARCH_HUGE_VMAP
arch/powerpc/Kconfig:   select HAVE_ARCH_HUGE_VMAP              if 
PPC_RADIX_MMU || PPC_8xx

PPC_8xx is 32 bits.

Christophe